665128132164 has 72 divisors (see below), whose sum is σ = 1693685564480. Its totient is φ = 220076160192.

The previous prime is 665128132153. The next prime is 665128132187. The reversal of 665128132164 is 461231821566.

665128132164 is a `hidden beast` number, since 66 + 512 + 8 + 13 + 2 + 1 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56954694 + ... + 56966370.

Almost surely, 2^665128132164 is an apocalyptic number.

It is an amenable number.

665128132164 is an abundant number, since it is smaller than the sum of its proper divisors (1028557432316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665128132164 is a wasteful number, since it uses less digits than its factorization.

665128132164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23209 (or 23204 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 665128132164 in words is "six hundred sixty-five billion, one hundred twenty-eight million, one hundred thirty-two thousand, one hundred sixty-four".